Photodegradation of Rhodamine B and Methyl Orange over Boron-Doped g-C3N4 under Visible Light Irradiation
Photodegradation of Rhodamine B and Methyl Orange over Boron-Doped g-C3N4 under Visible Light Irradiation
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DOI：
10.1021/la904023j
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发表时间：
2010-03-16
期刊：
影响因子：
3.9
通讯作者：
Zou, Z. G.
中科院分区：
文献类型：
--
作者：
Yan, S. C.;Li, Z. S.;Zou, Z. G.
分别以三聚氰胺和三聚氰胺与氧化硼的混合物为原料，通过加热制备了石墨碳氮化物（g-C_3 N_4）和硼掺杂g-C_3 N_4。采用X射线衍射、X射线光电子能谱和紫外-可见吸收光谱对样品进行表征，并采用电子顺磁共振技术对g-C3 N4光催化降解反应的活性物种进行检测。在对比实验的基础上，提出了罗丹明B（Rh B）和甲基橙子（MO）两种典型染料的光降解机理。在g-C3 N4体系中，Rh B和MO的光催化降解分别归因于直接空穴氧化和整体反应，而MO的光催化降解主要是由光生电子引发的还原过程，而不是光生空穴引发的氧化过程.对g-C_3 N_4进行硼掺杂可以促进Rh B的光降解，这是因为硼掺杂提高了催化剂的染料吸附和光吸收。
Graphitic carbon nitride (g-C3N4) and boron-doped g-C3N4 Were prepared by heating melamine and the mixture of melamine and boron oxide, respectively. X-ray diffraction, X-ray photoelectron spectroscopy, and UV-vis spectra were used to describe the properties of as-prepared samples, The electron paramagnetic resonance was used to detect the active species for the photodegradation reaction over g-C3N4. The photodegradation mechanisms for two typical dyes, rhodamine B (Rh B) and methyl orange (MO), are proposed based on our comparison experiments. In the g-C3N4 photocatalysis system, the photodegradation of Rh B and MO is attributed to the direct hole oxidation and overall reaction, respectively; however, for the MO photodegradation the reduction process initiated by photogenerated electrons is a major photocatalytic process compared with the oxidation process induced by photogenerated holes. Boron doping for g-C3N4 can promote photodegradation of Rh B because the boron doping improves the dye adsorption and light absorption of catalyst.